There are two types of dehumidifiers on the marketplace: warm mist and cool mist. Both have slight advantages and disadvantages. Regardless of the type of mist, both affect the level of moisture in the air and lower the humidity level.
Air cleaners or air purifiers pull air into a filter that removes large particles from the air. They are most commonly used to remove pollutants, including smoke, mold spores, pollen and pet dander.
According to the Center for Disease Control, mold thrives in moist, humid environments. Dehumidifiers can control and prevent mold growth by lowering the humidity levels in the air. Purifiers combat mold by removing spores from the air.
One of the items in household dust is dust mites. While in the air, particles can be easily filtered and removed. These household pests also need moisture to survive. According to the American College of Allergy, Asthma and Immunology, dehumidifiers can lower the humidity levels below 50 percent, which will cause dust mites to dry out and die.
While both types of units are highly effective in controlling mold and dust mites, only air purifiers can remove pet dander from the air. However, air purifiers can only remove airborne particles. Once pet dander settles on furniture, bedding, clothing and other items, it must be removed manually through vacuuming and cleaning.